Um ônibus de 8 m de comprimento, deslocando-se com uma velocidade constante de 36 km/h atravessa uma ponte de 12 m de comprimento. Qual o tempo gasto pelo ônibus, em segundos, para atravessar totalmente a ponte?

Uma chapa de cobre, cujo coeficiente de dilatação linear vale !$ 2.10{-5} !$ ºC !$ {-1} !$ , tem um orifício de raio 10 cm a 25 ºC. Um pino cuja área da base é 314,5 cm 2 a 25 ºC é preparado para ser introduzido no orifício da chapa. Dentre as opções abaixo, a temperatura da chapa, em ºC, que torna possível a entrada do pino no orifício, é
Adote !$ \pi !$ = 3,14

No circuito da figura abaixo, é correto afirmar que os resistores

O valor de x na equação !$ log_{ { \large 1 \over 3}} !$ !$ (log_{27} 3x) = 1 !$ é

Sejam !$ Z_1 !$ e !$ Z_2 !$ dois números complexos. Sabe-se que o produto de !$ Z_1 !$ e !$ Z_2 !$ é –10 + 10i. Se !$ Z_1 !$= 1 + 2i, então o valor de !$ Z_2 !$ é igual a

Winter s por ts

Only two areas of the USA are mild in winter, the coasts, especially Florida and southern Californ ia, and the southern part of the Mississippi basin.

Everywhere e lse it gets cold, often very cold. By the end of November, many Ame rican states are often covered in snow; and although recent winters have been less cold, sport in winter usually means winter sports, or indoor sports.

By January, many people in North America will have temperatures of -30°C; not every day, of course, but such low temperatures are not rare. In Chicago and Minneapolis, the temperature can fall below -40°.

When it is very cold, especially when there is a cold wind, people want to go outside, unless they have to; but on sunny winter days, winter sports are popular.

In the large flat regions in the middle of No rth America, winter sports are snowmobiling, snowshoeing and cross-country skiing. Ice-skating is popular too; lakes and rivers freeze, and many towns and cities have free open-air skating rinks. In many places, these are flood-lit after dark, so that people can enjoy skating in the evening.

Adapted from http://linguapress.com/intermediate/wintersports. usa.htm

Fill in the blank, with the suitable option:

Radiotelephone communications lack the facial cues, body language, and listening cues found in usual faceto- face situations. Communications without such cues are considered to be more difficult and challenging, requiring a higher degree of language proficiency, than face-to-face interactions. In addition, other features of radiotelephone communications make it a unique kind of communicative event, for example:

- The sound quality may be poor, with distracting sounds.

- The communicative workload of the air traffic controller or a pilot may be heavy, with a corresponding need for efficiency and brevity.

- In addition to their communicative tasks, pilots must also attend to all of the tasks involved in operating their aircraft.

Adapted from Document 9835 (ICAO, 2010, p. 2-6).

Write (T) for the true statements and (F) for the false statements, according to the text.

( ) Radiotelephone communications need to be efficient and brief.

( ) The sound in radiotelephone communications may not be good.

( ) In radiotelephone communications, there is no body language.

( ) Radiotelephone communications do not require a good level of language proficiency.

Choose the correct alternative, according to the order of the sentences.

O Distintivo da Organização Militar (DOM) da EEAR estádiante de um espelho. A imagem obtida pelo espelho e o objeto estão mostrados na figura abaixo.

De acordo com a figura, qual o tipo de espelho diante do DOM?

New York, New Jersey, Connecticut, Rhode Island and Massachusetts have declared states of emergency and 50 million people are expected to wake up to foot of snow on Tuesday, January 27, 2015.

In other development:

- 6,500 flights in and out of airports along East Coast cancelled;

- schools and businesses stopped early on Monday;

- New York’s subway and bus services stop at 23:00 local time;

- wind gusts of 75 mph or more are forecast for coastal areas of Massachusetts; and

- Boston’s Logan Airport said there would be no flights after 19:00 local time.

Adapted from http://www.bbc.com/news/world-us-canada-30978320

Fill in the blank in lines 3 and 6 with the right words:

Um tubo sonoro aberto em suas duas extremidades, tem 80 cm de comprimento e está vibrando no segundo harmônico. Considerando a velocidade de propagação do som no tubo igual a 360 m/s, a sua frequência de vibração, em hertz, será